Because I use it very often to make double tissue, not just small squares, but the whole sheet.
If you don't want wrinkles it is the best way to do it. But yet, you may have some warping or a few wrinkles and some trimming at the end.
I also use this brand in specific:
https://images.michaels.com/cms/michael ... .ViewAsset it let you fix some errors till certain point but you need to be as precise as you can.
I would not go for glue or anything very liquid to glue 2 sheets that large.